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builtins-collections-gen.cc
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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/builtins/builtins-collections-gen.h"
#include "src/builtins/builtins-constructor-gen.h"
#include "src/builtins/builtins-iterator-gen.h"
#include "src/builtins/builtins-utils-gen.h"
#include "src/codegen/code-stub-assembler-inl.h"
#include "src/execution/protectors.h"
#include "src/heap/factory-inl.h"
#include "src/heap/heap-inl.h"
#include "src/objects/hash-table-inl.h"
#include "src/objects/js-collection.h"
#include "src/objects/ordered-hash-table.h"
#include "src/roots/roots.h"
namespace v8 {
namespace internal {
#include "src/codegen/define-code-stub-assembler-macros.inc"
template <class T>
using TVariable = compiler::TypedCodeAssemblerVariable<T>;
void BaseCollectionsAssembler::AddConstructorEntry(
Variant variant, TNode<Context> context, TNode<Object> collection,
TNode<Object> add_function, TNode<Object> key_value,
Label* if_may_have_side_effects, Label* if_exception,
TVariable<Object>* var_exception) {
compiler::ScopedExceptionHandler handler(this, if_exception, var_exception);
CSA_DCHECK(this, Word32BinaryNot(IsHashTableHole(key_value)));
if (variant == kMap || variant == kWeakMap) {
TorqueStructKeyValuePair pair =
if_may_have_side_effects != nullptr
? LoadKeyValuePairNoSideEffects(context, key_value,
if_may_have_side_effects)
: LoadKeyValuePair(context, key_value);
TNode<Object> key_n = pair.key;
TNode<Object> value_n = pair.value;
Call(context, add_function, collection, key_n, value_n);
} else {
DCHECK(variant == kSet || variant == kWeakSet);
Call(context, add_function, collection, key_value);
}
}
void BaseCollectionsAssembler::AddConstructorEntries(
Variant variant, TNode<Context> context,
TNode<NativeContext> native_context, TNode<HeapObject> collection,
TNode<Object> initial_entries) {
CSA_DCHECK(this, Word32BinaryNot(IsNullOrUndefined(initial_entries)));
enum Mode { kSlow, kFastJSArray, kFastCollection };
TVARIABLE(IntPtrT, var_at_least_space_for, IntPtrConstant(0));
TVARIABLE(HeapObject, var_entries_table, UndefinedConstant());
TVARIABLE(Int32T, var_mode, Int32Constant(kSlow));
Label if_fast_js_array(this), allocate_table(this);
// The slow path is taken if the initial add function is modified. This check
// must precede the kSet fast path below, which has the side effect of
// exhausting {initial_entries} if it is a JSSetIterator.
GotoIfInitialAddFunctionModified(variant, native_context, collection,
&allocate_table);
GotoIf(IsFastJSArrayWithNoCustomIteration(context, initial_entries),
&if_fast_js_array);
if (variant == Variant::kSet) {
GetEntriesIfFastCollectionOrIterable(
variant, initial_entries, context, &var_entries_table,
&var_at_least_space_for, &allocate_table);
var_mode = Int32Constant(kFastCollection);
Goto(&allocate_table);
} else {
Goto(&allocate_table);
}
BIND(&if_fast_js_array);
{
var_mode = Int32Constant(kFastJSArray);
if (variant == kWeakSet || variant == kWeakMap) {
var_at_least_space_for =
PositiveSmiUntag(LoadFastJSArrayLength(CAST(initial_entries)));
} else {
// TODO(ishell): consider using array length for all collections
static_assert(OrderedHashSet::kInitialCapacity ==
OrderedHashMap::kInitialCapacity);
var_at_least_space_for = IntPtrConstant(OrderedHashSet::kInitialCapacity);
}
Goto(&allocate_table);
}
TVARIABLE(JSReceiver, var_iterator_object);
TVARIABLE(Object, var_exception);
Label exit(this), from_fast_jsarray(this), from_fast_collection(this),
slow_loop(this, Label::kDeferred), if_exception(this, Label::kDeferred);
BIND(&allocate_table);
{
TNode<HeapObject> table =
AllocateTable(variant, var_at_least_space_for.value());
StoreObjectField(collection, GetTableOffset(variant), table);
if (variant == Variant::kSet) {
GotoIf(Word32Equal(var_mode.value(), Int32Constant(kFastCollection)),
&from_fast_collection);
}
Branch(Word32Equal(var_mode.value(), Int32Constant(kFastJSArray)),
&from_fast_jsarray, &slow_loop);
}
BIND(&from_fast_jsarray);
{
Label if_exception_during_fast_iteration(this, Label::kDeferred);
TVARIABLE(IntPtrT, var_index, IntPtrConstant(0));
TNode<JSArray> initial_entries_jsarray =
UncheckedCast<JSArray>(initial_entries);
#if DEBUG
CSA_DCHECK(this, IsFastJSArrayWithNoCustomIteration(
context, initial_entries_jsarray));
TNode<Map> original_initial_entries_map = LoadMap(initial_entries_jsarray);
#endif
Label if_may_have_side_effects(this, Label::kDeferred);
{
compiler::ScopedExceptionHandler handler(
this, &if_exception_during_fast_iteration, &var_exception);
AddConstructorEntriesFromFastJSArray(
variant, context, native_context, collection, initial_entries_jsarray,
&if_may_have_side_effects, var_index);
}
Goto(&exit);
if (variant == kMap || variant == kWeakMap) {
BIND(&if_may_have_side_effects);
#if DEBUG
{
// Check that add/set function has not been modified.
Label if_not_modified(this), if_modified(this);
GotoIfInitialAddFunctionModified(variant, native_context, collection,
&if_modified);
Goto(&if_not_modified);
BIND(&if_modified);
Unreachable();
BIND(&if_not_modified);
}
CSA_DCHECK(this, TaggedEqual(original_initial_entries_map,
LoadMap(initial_entries_jsarray)));
#endif
var_mode = Int32Constant(kSlow);
Goto(&allocate_table);
}
BIND(&if_exception_during_fast_iteration);
{
// In case exception is thrown during collection population, materialize
// the iteator and execute iterator closing protocol. It might be
// non-trivial in case "return" callback is added somewhere in the
// iterator's prototype chain.
TNode<NativeContext> native_context = LoadNativeContext(context);
TNode<IntPtrT> next_index =
IntPtrAdd(var_index.value(), IntPtrConstant(1));
var_iterator_object = CreateArrayIterator(
native_context, UncheckedCast<JSArray>(initial_entries),
IterationKind::kValues, SmiTag(next_index));
Goto(&if_exception);
}
}
if (variant == Variant::kSet) {
BIND(&from_fast_collection);
{
AddConstructorEntriesFromFastCollection(variant, collection,
var_entries_table.value());
Goto(&exit);
}
}
BIND(&slow_loop);
{
AddConstructorEntriesFromIterable(
variant, context, native_context, collection, initial_entries,
&if_exception, &var_iterator_object, &var_exception);
Goto(&exit);
}
BIND(&if_exception);
{
TNode<HeapObject> message = GetPendingMessage();
SetPendingMessage(TheHoleConstant());
// iterator.next field is not used by IteratorCloseOnException.
TorqueStructIteratorRecord iterator = {var_iterator_object.value(), {}};
IteratorCloseOnException(context, iterator);
CallRuntime(Runtime::kReThrowWithMessage, context, var_exception.value(),
message);
Unreachable();
}
BIND(&exit);
}
void BaseCollectionsAssembler::AddConstructorEntriesFromFastJSArray(
Variant variant, TNode<Context> context, TNode<Context> native_context,
TNode<Object> collection, TNode<JSArray> fast_jsarray,
Label* if_may_have_side_effects, TVariable<IntPtrT>& var_current_index) {
TNode<FixedArrayBase> elements = LoadElements(fast_jsarray);
TNode<Int32T> elements_kind = LoadElementsKind(fast_jsarray);
TNode<JSFunction> add_func = GetInitialAddFunction(variant, native_context);
CSA_DCHECK(this,
TaggedEqual(GetAddFunction(variant, native_context, collection),
add_func));
CSA_DCHECK(this, IsFastJSArrayWithNoCustomIteration(context, fast_jsarray));
TNode<IntPtrT> length = PositiveSmiUntag(LoadFastJSArrayLength(fast_jsarray));
CSA_DCHECK(
this, HasInitialCollectionPrototype(variant, native_context, collection));
#if DEBUG
TNode<Map> original_collection_map = LoadMap(CAST(collection));
TNode<Map> original_fast_js_array_map = LoadMap(fast_jsarray);
#endif
Label exit(this), if_doubles(this), if_smiorobjects(this);
GotoIf(IntPtrEqual(length, IntPtrConstant(0)), &exit);
Branch(IsFastSmiOrTaggedElementsKind(elements_kind), &if_smiorobjects,
&if_doubles);
BIND(&if_smiorobjects);
{
auto set_entry = [&](TNode<IntPtrT> index) {
TNode<Object> element =
LoadAndNormalizeFixedArrayElement(CAST(elements), index);
AddConstructorEntry(variant, context, collection, add_func, element,
if_may_have_side_effects);
};
// Instead of using the slower iteration protocol to iterate over the
// elements, a fast loop is used. This assumes that adding an element
// to the collection does not call user code that could mutate the elements
// or collection.
BuildFastLoop<IntPtrT>(var_current_index, IntPtrConstant(0), length,
set_entry, 1, LoopUnrollingMode::kNo,
IndexAdvanceMode::kPost);
Goto(&exit);
}
BIND(&if_doubles);
{
// A Map constructor requires entries to be arrays (ex. [key, value]),
// so a FixedDoubleArray can never succeed.
if (variant == kMap || variant == kWeakMap) {
CSA_DCHECK(this, IntPtrGreaterThan(length, IntPtrConstant(0)));
TNode<Object> element =
LoadAndNormalizeFixedDoubleArrayElement(elements, IntPtrConstant(0));
ThrowTypeError(context, MessageTemplate::kIteratorValueNotAnObject,
element);
} else {
DCHECK(variant == kSet || variant == kWeakSet);
auto set_entry = [&](TNode<IntPtrT> index) {
TNode<Object> entry = LoadAndNormalizeFixedDoubleArrayElement(
elements, UncheckedCast<IntPtrT>(index));
AddConstructorEntry(variant, context, collection, add_func, entry);
};
BuildFastLoop<IntPtrT>(var_current_index, IntPtrConstant(0), length,
set_entry, 1, LoopUnrollingMode::kNo,
IndexAdvanceMode::kPost);
Goto(&exit);
}
}
BIND(&exit);
#if DEBUG
CSA_DCHECK(this,
TaggedEqual(original_collection_map, LoadMap(CAST(collection))));
CSA_DCHECK(this,
TaggedEqual(original_fast_js_array_map, LoadMap(fast_jsarray)));
#endif
}
void BaseCollectionsAssembler::AddConstructorEntriesFromIterable(
Variant variant, TNode<Context> context, TNode<Context> native_context,
TNode<Object> collection, TNode<Object> iterable, Label* if_exception,
TVariable<JSReceiver>* var_iterator_object,
TVariable<Object>* var_exception) {
Label exit(this), loop(this);
CSA_DCHECK(this, Word32BinaryNot(IsNullOrUndefined(iterable)));
TNode<Object> add_func = GetAddFunction(variant, context, collection);
IteratorBuiltinsAssembler iterator_assembler(this->state());
TorqueStructIteratorRecord iterator =
iterator_assembler.GetIterator(context, iterable);
*var_iterator_object = iterator.object;
CSA_DCHECK(this, Word32BinaryNot(IsUndefined(iterator.object)));
TNode<Map> fast_iterator_result_map = CAST(
LoadContextElement(native_context, Context::ITERATOR_RESULT_MAP_INDEX));
Goto(&loop);
BIND(&loop);
{
TNode<JSReceiver> next = iterator_assembler.IteratorStep(
context, iterator, &exit, fast_iterator_result_map);
TNode<Object> next_value = iterator_assembler.IteratorValue(
context, next, fast_iterator_result_map);
AddConstructorEntry(variant, context, collection, add_func, next_value,
nullptr, if_exception, var_exception);
Goto(&loop);
}
BIND(&exit);
}
RootIndex BaseCollectionsAssembler::GetAddFunctionNameIndex(Variant variant) {
switch (variant) {
case kMap:
case kWeakMap:
return RootIndex::kset_string;
case kSet:
case kWeakSet:
return RootIndex::kadd_string;
}
UNREACHABLE();
}
void BaseCollectionsAssembler::GotoIfInitialAddFunctionModified(
Variant variant, TNode<NativeContext> native_context,
TNode<HeapObject> collection, Label* if_modified) {
static_assert(JSCollection::kAddFunctionDescriptorIndex ==
JSWeakCollection::kAddFunctionDescriptorIndex);
// TODO(jgruber): Investigate if this should also fall back to full prototype
// verification.
static constexpr PrototypeCheckAssembler::Flags flags{
PrototypeCheckAssembler::kCheckPrototypePropertyConstness};
static constexpr int kNoContextIndex = -1;
static_assert(
(flags & PrototypeCheckAssembler::kCheckPrototypePropertyIdentity) == 0);
using DescriptorIndexNameValue =
PrototypeCheckAssembler::DescriptorIndexNameValue;
DescriptorIndexNameValue property_to_check{
JSCollection::kAddFunctionDescriptorIndex,
GetAddFunctionNameIndex(variant), kNoContextIndex};
PrototypeCheckAssembler prototype_check_assembler(
state(), flags, native_context,
GetInitialCollectionPrototype(variant, native_context),
base::Vector<DescriptorIndexNameValue>(&property_to_check, 1));
TNode<HeapObject> prototype = LoadMapPrototype(LoadMap(collection));
Label if_unmodified(this);
prototype_check_assembler.CheckAndBranch(prototype, &if_unmodified,
if_modified);
BIND(&if_unmodified);
}
TNode<JSObject> BaseCollectionsAssembler::AllocateJSCollection(
TNode<Context> context, TNode<JSFunction> constructor,
TNode<JSReceiver> new_target) {
TNode<BoolT> is_target_unmodified = TaggedEqual(constructor, new_target);
return Select<JSObject>(
is_target_unmodified,
[=, this] { return AllocateJSCollectionFast(constructor); },
[=, this] {
return AllocateJSCollectionSlow(context, constructor, new_target);
});
}
TNode<JSObject> BaseCollectionsAssembler::AllocateJSCollectionFast(
TNode<JSFunction> constructor) {
CSA_DCHECK(this, IsConstructorMap(LoadMap(constructor)));
TNode<Map> initial_map =
CAST(LoadJSFunctionPrototypeOrInitialMap(constructor));
return AllocateJSObjectFromMap(initial_map);
}
TNode<JSObject> BaseCollectionsAssembler::AllocateJSCollectionSlow(
TNode<Context> context, TNode<JSFunction> constructor,
TNode<JSReceiver> new_target) {
ConstructorBuiltinsAssembler constructor_assembler(this->state());
return constructor_assembler.FastNewObject(context, constructor, new_target);
}
void BaseCollectionsAssembler::GenerateConstructor(
Variant variant, Handle<String> constructor_function_name,
TNode<Object> new_target, TNode<IntPtrT> argc, TNode<Context> context) {
const int kIterableArg = 0;
CodeStubArguments args(this, argc);
TNode<Object> iterable = args.GetOptionalArgumentValue(kIterableArg);
Label if_undefined(this, Label::kDeferred);
GotoIf(IsUndefined(new_target), &if_undefined);
TNode<NativeContext> native_context = LoadNativeContext(context);
TNode<JSObject> collection = AllocateJSCollection(
context, GetConstructor(variant, native_context), CAST(new_target));
Label add_constructor_entries(this);
// The empty case.
//
// This is handled specially to simplify AddConstructorEntries, which is
// complex and contains multiple fast paths.
GotoIfNot(IsNullOrUndefined(iterable), &add_constructor_entries);
TNode<HeapObject> table = AllocateTable(variant, IntPtrConstant(0));
StoreObjectField(collection, GetTableOffset(variant), table);
Return(collection);
BIND(&add_constructor_entries);
AddConstructorEntries(variant, context, native_context, collection, iterable);
Return(collection);
BIND(&if_undefined);
ThrowTypeError(context, MessageTemplate::kConstructorNotFunction,
HeapConstantNoHole(constructor_function_name));
}
TNode<Object> BaseCollectionsAssembler::GetAddFunction(
Variant variant, TNode<Context> context, TNode<Object> collection) {
Handle<String> add_func_name = (variant == kMap || variant == kWeakMap)
? isolate()->factory()->set_string()
: isolate()->factory()->add_string();
TNode<Object> add_func = GetProperty(context, collection, add_func_name);
Label exit(this), if_notcallable(this, Label::kDeferred);
GotoIf(TaggedIsSmi(add_func), &if_notcallable);
GotoIfNot(IsCallable(CAST(add_func)), &if_notcallable);
Goto(&exit);
BIND(&if_notcallable);
ThrowTypeError(context, MessageTemplate::kPropertyNotFunction, add_func,
HeapConstantNoHole(add_func_name), collection);
BIND(&exit);
return add_func;
}
TNode<JSFunction> BaseCollectionsAssembler::GetConstructor(
Variant variant, TNode<Context> native_context) {
int index;
switch (variant) {
case kMap:
index = Context::JS_MAP_FUN_INDEX;
break;
case kSet:
index = Context::JS_SET_FUN_INDEX;
break;
case kWeakMap:
index = Context::JS_WEAK_MAP_FUN_INDEX;
break;
case kWeakSet:
index = Context::JS_WEAK_SET_FUN_INDEX;
break;
}
return CAST(LoadContextElement(native_context, index));
}
TNode<JSFunction> BaseCollectionsAssembler::GetInitialAddFunction(
Variant variant, TNode<Context> native_context) {
int index;
switch (variant) {
case kMap:
index = Context::MAP_SET_INDEX;
break;
case kSet:
index = Context::SET_ADD_INDEX;
break;
case kWeakMap:
index = Context::WEAKMAP_SET_INDEX;
break;
case kWeakSet:
index = Context::WEAKSET_ADD_INDEX;
break;
}
return CAST(LoadContextElement(native_context, index));
}
int BaseCollectionsAssembler::GetTableOffset(Variant variant) {
switch (variant) {
case kMap:
return JSMap::kTableOffset;
case kSet:
return JSSet::kTableOffset;
case kWeakMap:
return JSWeakMap::kTableOffset;
case kWeakSet:
return JSWeakSet::kTableOffset;
}
UNREACHABLE();
}
// https://tc39.es/ecma262/#sec-canbeheldweakly
void BaseCollectionsAssembler::GotoIfCannotBeHeldWeakly(
const TNode<Object> obj, Label* if_cannot_be_held_weakly) {
Label check_symbol_key(this);
Label end(this);
GotoIf(TaggedIsSmi(obj), if_cannot_be_held_weakly);
TNode<Uint16T> instance_type = LoadMapInstanceType(LoadMap(CAST(obj)));
GotoIfNot(IsJSReceiverInstanceType(instance_type), &check_symbol_key);
// TODO(v8:12547) Shared structs and arrays should only be able to point
// to shared values in weak collections. For now, disallow them as weak
// collection keys.
GotoIf(IsAlwaysSharedSpaceJSObjectInstanceType(instance_type),
if_cannot_be_held_weakly);
Goto(&end);
Bind(&check_symbol_key);
GotoIfNot(IsSymbolInstanceType(instance_type), if_cannot_be_held_weakly);
TNode<Uint32T> flags = LoadSymbolFlags(CAST(obj));
GotoIf(Word32And(flags, Symbol::IsInPublicSymbolTableBit::kMask),
if_cannot_be_held_weakly);
Goto(&end);
Bind(&end);
}
TNode<Map> BaseCollectionsAssembler::GetInitialCollectionPrototype(
Variant variant, TNode<Context> native_context) {
int initial_prototype_index;
switch (variant) {
case kMap:
initial_prototype_index = Context::INITIAL_MAP_PROTOTYPE_MAP_INDEX;
break;
case kSet:
initial_prototype_index = Context::INITIAL_SET_PROTOTYPE_MAP_INDEX;
break;
case kWeakMap:
initial_prototype_index = Context::INITIAL_WEAKMAP_PROTOTYPE_MAP_INDEX;
break;
case kWeakSet:
initial_prototype_index = Context::INITIAL_WEAKSET_PROTOTYPE_MAP_INDEX;
break;
}
return CAST(LoadContextElement(native_context, initial_prototype_index));
}
TNode<BoolT> BaseCollectionsAssembler::HasInitialCollectionPrototype(
Variant variant, TNode<Context> native_context, TNode<Object> collection) {
TNode<Map> collection_proto_map =
LoadMap(LoadMapPrototype(LoadMap(CAST(collection))));
return TaggedEqual(collection_proto_map,
GetInitialCollectionPrototype(variant, native_context));
}
TNode<Object> BaseCollectionsAssembler::LoadAndNormalizeFixedArrayElement(
TNode<FixedArray> elements, TNode<IntPtrT> index) {
TNode<Object> element = UnsafeLoadFixedArrayElement(elements, index);
return Select<Object>(
IsTheHole(element), [=, this] { return UndefinedConstant(); },
[=] { return element; });
}
TNode<Object> BaseCollectionsAssembler::LoadAndNormalizeFixedDoubleArrayElement(
TNode<HeapObject> elements, TNode<IntPtrT> index) {
TVARIABLE(Object, entry);
Label if_hole(this, Label::kDeferred), next(this);
TNode<Float64T> element =
LoadFixedDoubleArrayElement(CAST(elements), index, &if_hole);
{ // not hole
entry = AllocateHeapNumberWithValue(element);
Goto(&next);
}
BIND(&if_hole);
{
entry = UndefinedConstant();
Goto(&next);
}
BIND(&next);
return entry.value();
}
template <typename CollectionType>
void CollectionsBuiltinsAssembler::FindOrderedHashTableEntry(
const TNode<CollectionType> table, const TNode<Uint32T> hash,
const std::function<void(TNode<Object>, Label*, Label*)>& key_compare,
TVariable<IntPtrT>* entry_start_position, Label* entry_found,
Label* not_found) {
// Get the index of the bucket.
const TNode<Uint32T> number_of_buckets =
PositiveSmiToUint32(CAST(UnsafeLoadFixedArrayElement(
table, CollectionType::NumberOfBucketsIndex())));
const TNode<Uint32T> bucket =
Word32And(hash, Uint32Sub(number_of_buckets, Uint32Constant(1)));
const TNode<IntPtrT> first_entry = SmiUntag(CAST(UnsafeLoadFixedArrayElement(
table, Signed(ChangeUint32ToWord(bucket)),
CollectionType::HashTableStartIndex() * kTaggedSize)));
const TNode<IntPtrT> number_of_buckets_intptr =
Signed(ChangeUint32ToWord(number_of_buckets));
// Walk the bucket chain.
TNode<IntPtrT> entry_start;
Label if_key_found(this);
{
TVARIABLE(IntPtrT, var_entry, first_entry);
Label loop(this, {&var_entry, entry_start_position}),
continue_next_entry(this);
Goto(&loop);
BIND(&loop);
// If the entry index is the not-found sentinel, we are done.
GotoIf(IntPtrEqual(var_entry.value(),
IntPtrConstant(CollectionType::kNotFound)),
not_found);
// Make sure the entry index is within range.
CSA_DCHECK(
this,
UintPtrLessThan(
var_entry.value(),
PositiveSmiUntag(SmiAdd(
CAST(UnsafeLoadFixedArrayElement(
table, CollectionType::NumberOfElementsIndex())),
CAST(UnsafeLoadFixedArrayElement(
table, CollectionType::NumberOfDeletedElementsIndex()))))));
// Compute the index of the entry relative to kHashTableStartIndex.
entry_start =
IntPtrAdd(IntPtrMul(var_entry.value(),
IntPtrConstant(CollectionType::kEntrySize)),
number_of_buckets_intptr);
// Load the key from the entry.
const TNode<Object> candidate_key =
UnsafeLoadKeyFromOrderedHashTableEntry(table, entry_start);
key_compare(candidate_key, &if_key_found, &continue_next_entry);
BIND(&continue_next_entry);
// Load the index of the next entry in the bucket chain.
var_entry = SmiUntag(CAST(UnsafeLoadFixedArrayElement(
table, entry_start,
(CollectionType::HashTableStartIndex() + CollectionType::kChainOffset) *
kTaggedSize)));
Goto(&loop);
}
BIND(&if_key_found);
*entry_start_position = entry_start;
Goto(entry_found);
}
// a helper function to unwrap a fast js collection and load its length.
// var_entries_table is a variable meant to store the unwrapped collection.
// var_number_of_elements is a variable meant to store the length of the
// unwrapped collection. the function jumps to if_not_fast_collection if the
// collection is not a fast js collection.
void CollectionsBuiltinsAssembler::GetEntriesIfFastCollectionOrIterable(
Variant variant, TNode<Object> initial_entries, TNode<Context> context,
TVariable<HeapObject>* var_entries_table,
TVariable<IntPtrT>* var_number_of_elements, Label* if_not_fast_collection) {
Label if_fast_js_set(this), exit(this);
DCHECK_EQ(variant, kSet);
BranchIfIterableWithOriginalValueSetIterator(
initial_entries, context, &if_fast_js_set, if_not_fast_collection);
BIND(&if_fast_js_set);
{
*var_entries_table = SetOrSetIteratorToSet(initial_entries);
TNode<Smi> size_smi = LoadObjectField<Smi>(
var_entries_table->value(), OrderedHashMap::NumberOfElementsOffset());
*var_number_of_elements = PositiveSmiUntag(size_smi);
Goto(&exit);
}
BIND(&exit);
}
void CollectionsBuiltinsAssembler::AddConstructorEntriesFromSet(
TNode<JSSet> collection, TNode<OrderedHashSet> table) {
TNode<OrderedHashSet> entry_table = LoadObjectField<OrderedHashSet>(
collection, GetTableOffset(Variant::kSet));
TNode<IntPtrT> number_of_buckets =
PositiveSmiUntag(CAST(UnsafeLoadFixedArrayElement(
table, OrderedHashSet::NumberOfBucketsIndex())));
TNode<IntPtrT> number_of_elements = LoadAndUntagPositiveSmiObjectField(
table, OrderedHashSet::NumberOfElementsOffset());
TNode<IntPtrT> number_of_deleted_elements = PositiveSmiUntag(CAST(
LoadObjectField(table, OrderedHashSet::NumberOfDeletedElementsOffset())));
TNode<IntPtrT> used_capacity =
IntPtrAdd(number_of_elements, number_of_deleted_elements);
TNode<IntPtrT> loop_bound = IntPtrAdd(
IntPtrMul(used_capacity, IntPtrConstant(OrderedHashSet::kEntrySize)),
number_of_buckets);
TNode<IntPtrT> number_of_buckets_entry_table =
PositiveSmiUntag(CAST(UnsafeLoadFixedArrayElement(
entry_table, OrderedHashSet::NumberOfBucketsIndex())));
TVARIABLE(Object, entry_key);
TVARIABLE(IntPtrT, var_entry_table_occupancy, IntPtrConstant(0));
VariableList loop_vars({&var_entry_table_occupancy}, zone());
Label exit(this);
auto set_entry = [&](TNode<IntPtrT> index) {
entry_key = UnsafeLoadKeyFromOrderedHashTableEntry(table, index);
Label if_key_is_not_hole(this), continue_loop(this);
Branch(IsHashTableHole(entry_key.value()), &continue_loop,
&if_key_is_not_hole);
BIND(&if_key_is_not_hole);
{
AddNewToOrderedHashSet(entry_table, entry_key.value(),
number_of_buckets_entry_table,
var_entry_table_occupancy.value());
Increment(&var_entry_table_occupancy, 1);
Goto(&continue_loop);
}
BIND(&continue_loop);
return;
};
// Instead of using the slower iteration protocol to iterate over the
// elements, a fast loop is used. This assumes that adding an element
// to the collection does not call user code that could mutate the elements
// or collection. The iteration is based on the layout of the ordered hash
// table.
BuildFastLoop<IntPtrT>(loop_vars, number_of_buckets, loop_bound, set_entry,
OrderedHashSet::kEntrySize, LoopUnrollingMode::kNo,
IndexAdvanceMode::kPost);
Goto(&exit);
BIND(&exit);
}
void CollectionsBuiltinsAssembler::AddConstructorEntriesFromFastCollection(
Variant variant, TNode<HeapObject> collection,
TNode<HeapObject> source_table) {
if (variant == kSet) {
AddConstructorEntriesFromSet(CAST(collection), CAST(source_table));
return;
}
}
template <typename IteratorType>
TNode<HeapObject> CollectionsBuiltinsAssembler::AllocateJSCollectionIterator(
const TNode<Context> context, int map_index,
const TNode<HeapObject> collection) {
const TNode<Object> table =
LoadObjectField(collection, JSCollection::kTableOffset);
const TNode<NativeContext> native_context = LoadNativeContext(context);
const TNode<Map> iterator_map =
CAST(LoadContextElement(native_context, map_index));
const TNode<HeapObject> iterator =
AllocateInNewSpace(IteratorType::kHeaderSize);
StoreMapNoWriteBarrier(iterator, iterator_map);
StoreObjectFieldRoot(iterator, IteratorType::kPropertiesOrHashOffset,
RootIndex::kEmptyFixedArray);
StoreObjectFieldRoot(iterator, IteratorType::kElementsOffset,
RootIndex::kEmptyFixedArray);
StoreObjectFieldNoWriteBarrier(iterator, IteratorType::kTableOffset, table);
StoreObjectFieldNoWriteBarrier(iterator, IteratorType::kIndexOffset,
SmiConstant(0));
return iterator;
}
TNode<HeapObject> CollectionsBuiltinsAssembler::AllocateTable(
Variant variant, TNode<IntPtrT> at_least_space_for) {
if (variant == kMap) {
return AllocateOrderedHashMap();
} else {
DCHECK_EQ(variant, kSet);
TNode<IntPtrT> capacity = HashTableComputeCapacity(at_least_space_for);
return AllocateOrderedHashSet(capacity);
}
}
TF_BUILTIN(MapConstructor, CollectionsBuiltinsAssembler) {
auto new_target = Parameter<Object>(Descriptor::kJSNewTarget);
TNode<IntPtrT> argc = ChangeInt32ToIntPtr(
UncheckedParameter<Int32T>(Descriptor::kJSActualArgumentsCount));
auto context = Parameter<Context>(Descriptor::kContext);
GenerateConstructor(kMap, isolate()->factory()->Map_string(), new_target,
argc, context);
}
TF_BUILTIN(SetConstructor, CollectionsBuiltinsAssembler) {
auto new_target = Parameter<Object>(Descriptor::kJSNewTarget);
TNode<IntPtrT> argc = ChangeInt32ToIntPtr(
UncheckedParameter<Int32T>(Descriptor::kJSActualArgumentsCount));
auto context = Parameter<Context>(Descriptor::kContext);
GenerateConstructor(kSet, isolate()->factory()->Set_string(), new_target,
argc, context);
}
TNode<Smi> CollectionsBuiltinsAssembler::CallGetOrCreateHashRaw(
const TNode<HeapObject> key) {
const TNode<ExternalReference> function_addr =
ExternalConstant(ExternalReference::get_or_create_hash_raw());
const TNode<ExternalReference> isolate_ptr =
ExternalConstant(ExternalReference::isolate_address());
MachineType type_ptr = MachineType::Pointer();
MachineType type_tagged = MachineType::AnyTagged();
TNode<Smi> result = CAST(CallCFunction(function_addr, type_tagged,
std::make_pair(type_ptr, isolate_ptr),
std::make_pair(type_tagged, key)));
return result;
}
TNode<Uint32T> CollectionsBuiltinsAssembler::CallGetHashRaw(
const TNode<HeapObject> key) {
const TNode<ExternalReference> function_addr =
ExternalConstant(ExternalReference::orderedhashmap_gethash_raw());
const TNode<ExternalReference> isolate_ptr =
ExternalConstant(ExternalReference::isolate_address());
MachineType type_ptr = MachineType::Pointer();
MachineType type_tagged = MachineType::AnyTagged();
TNode<Smi> result = CAST(CallCFunction(function_addr, type_tagged,
std::make_pair(type_ptr, isolate_ptr),
std::make_pair(type_tagged, key)));
return PositiveSmiToUint32(result);
}
TNode<Uint32T> CollectionsBuiltinsAssembler::GetHash(
const TNode<HeapObject> key) {
TVARIABLE(Uint32T, var_hash);
Label if_receiver(this), if_other(this), done(this);
Branch(IsJSReceiver(key), &if_receiver, &if_other);
BIND(&if_receiver);
{
var_hash = LoadJSReceiverIdentityHash(CAST(key));
Goto(&done);
}
BIND(&if_other);
{
var_hash = CallGetHashRaw(key);
Goto(&done);
}
BIND(&done);
return var_hash.value();
}
void CollectionsBuiltinsAssembler::SameValueZeroSmi(TNode<Smi> key_smi,
TNode<Object> candidate_key,
Label* if_same,
Label* if_not_same) {
// If the key is the same, we are done.
GotoIf(TaggedEqual(candidate_key, key_smi), if_same);
// If the candidate key is smi, then it must be different (because
// we already checked for equality above).
GotoIf(TaggedIsSmi(candidate_key), if_not_same);
// If the candidate key is not smi, we still have to check if it is a
// heap number with the same value.
GotoIfNot(IsHeapNumber(CAST(candidate_key)), if_not_same);
const TNode<Float64T> candidate_key_number =
LoadHeapNumberValue(CAST(candidate_key));
const TNode<Float64T> key_number = SmiToFloat64(key_smi);
GotoIf(Float64Equal(candidate_key_number, key_number), if_same);
Goto(if_not_same);
}
void CollectionsBuiltinsAssembler::BranchIfMapIteratorProtectorValid(
Label* if_true, Label* if_false) {
TNode<PropertyCell> protector_cell = MapIteratorProtectorConstant();
DCHECK(i::IsPropertyCell(isolate()->heap()->map_iterator_protector()));
Branch(
TaggedEqual(LoadObjectField(protector_cell, PropertyCell::kValueOffset),
SmiConstant(Protectors::kProtectorValid)),
if_true, if_false);
}
void CollectionsBuiltinsAssembler::
BranchIfIterableWithOriginalKeyOrValueMapIterator(TNode<Object> iterator,
TNode<Context> context,
Label* if_true,
Label* if_false) {
Label if_key_or_value_iterator(this), extra_checks(this);
// Check if iterator is a keys or values JSMapIterator.
GotoIf(TaggedIsSmi(iterator), if_false);
TNode<Map> iter_map = LoadMap(CAST(iterator));
const TNode<Uint16T> instance_type = LoadMapInstanceType(iter_map);
GotoIf(InstanceTypeEqual(instance_type, JS_MAP_KEY_ITERATOR_TYPE),
&if_key_or_value_iterator);
Branch(InstanceTypeEqual(instance_type, JS_MAP_VALUE_ITERATOR_TYPE),
&if_key_or_value_iterator, if_false);
BIND(&if_key_or_value_iterator);
// Check that the iterator is not partially consumed.
const TNode<Object> index =
LoadObjectField(CAST(iterator), JSMapIterator::kIndexOffset);
GotoIfNot(TaggedEqual(index, SmiConstant(0)), if_false);
BranchIfMapIteratorProtectorValid(&extra_checks, if_false);
BIND(&extra_checks);
// Check if the iterator object has the original %MapIteratorPrototype%.
const TNode<NativeContext> native_context = LoadNativeContext(context);
const TNode<Object> initial_map_iter_proto = LoadContextElement(
native_context, Context::INITIAL_MAP_ITERATOR_PROTOTYPE_INDEX);
const TNode<HeapObject> map_iter_proto = LoadMapPrototype(iter_map);
GotoIfNot(TaggedEqual(map_iter_proto, initial_map_iter_proto), if_false);
// Check if the original MapIterator prototype has the original
// %IteratorPrototype%.
const TNode<Object> initial_iter_proto = LoadContextElement(
native_context, Context::INITIAL_ITERATOR_PROTOTYPE_INDEX);
const TNode<HeapObject> iter_proto =
LoadMapPrototype(LoadMap(map_iter_proto));
Branch(TaggedEqual(iter_proto, initial_iter_proto), if_true, if_false);
}
void BranchIfIterableWithOriginalKeyOrValueMapIterator(
compiler::CodeAssemblerState* state, TNode<Object> iterable,
TNode<Context> context, compiler::CodeAssemblerLabel* if_true,
compiler::CodeAssemblerLabel* if_false) {
CollectionsBuiltinsAssembler assembler(state);
assembler.BranchIfIterableWithOriginalKeyOrValueMapIterator(
iterable, context, if_true, if_false);
}
void CollectionsBuiltinsAssembler::BranchIfSetIteratorProtectorValid(
Label* if_true, Label* if_false) {
const TNode<PropertyCell> protector_cell = SetIteratorProtectorConstant();
DCHECK(i::IsPropertyCell(isolate()->heap()->set_iterator_protector()));
Branch(
TaggedEqual(LoadObjectField(protector_cell, PropertyCell::kValueOffset),
SmiConstant(Protectors::kProtectorValid)),
if_true, if_false);
}
void CollectionsBuiltinsAssembler::BranchIfIterableWithOriginalValueSetIterator(
TNode<Object> iterable, TNode<Context> context, Label* if_true,
Label* if_false) {
Label if_set(this), if_value_iterator(this), check_protector(this);
TVARIABLE(BoolT, var_result);
GotoIf(TaggedIsSmi(iterable), if_false);
TNode<Map> iterable_map = LoadMap(CAST(iterable));
const TNode<Uint16T> instance_type = LoadMapInstanceType(iterable_map);
GotoIf(InstanceTypeEqual(instance_type, JS_SET_TYPE), &if_set);
Branch(InstanceTypeEqual(instance_type, JS_SET_VALUE_ITERATOR_TYPE),
&if_value_iterator, if_false);
BIND(&if_set);
// Check if the set object has the original Set prototype.
const TNode<Object> initial_set_proto = LoadContextElement(
LoadNativeContext(context), Context::INITIAL_SET_PROTOTYPE_INDEX);
const TNode<HeapObject> set_proto = LoadMapPrototype(iterable_map);
GotoIfNot(TaggedEqual(set_proto, initial_set_proto), if_false);
Goto(&check_protector);
BIND(&if_value_iterator);
// Check that the iterator is not partially consumed.
const TNode<Object> index =
LoadObjectField(CAST(iterable), JSSetIterator::kIndexOffset);
GotoIfNot(TaggedEqual(index, SmiConstant(0)), if_false);
// Check if the iterator object has the original SetIterator prototype.
const TNode<NativeContext> native_context = LoadNativeContext(context);
const TNode<Object> initial_set_iter_proto = LoadContextElement(
native_context, Context::INITIAL_SET_ITERATOR_PROTOTYPE_INDEX);
const TNode<HeapObject> set_iter_proto = LoadMapPrototype(iterable_map);
GotoIfNot(TaggedEqual(set_iter_proto, initial_set_iter_proto), if_false);
// Check if the original SetIterator prototype has the original
// %IteratorPrototype%.
const TNode<Object> initial_iter_proto = LoadContextElement(
native_context, Context::INITIAL_ITERATOR_PROTOTYPE_INDEX);
const TNode<HeapObject> iter_proto =
LoadMapPrototype(LoadMap(set_iter_proto));
GotoIfNot(TaggedEqual(iter_proto, initial_iter_proto), if_false);
Goto(&check_protector);
BIND(&check_protector);
BranchIfSetIteratorProtectorValid(if_true, if_false);
}
void BranchIfIterableWithOriginalValueSetIterator(
compiler::CodeAssemblerState* state, TNode<Object> iterable,
TNode<Context> context, compiler::CodeAssemblerLabel* if_true,
compiler::CodeAssemblerLabel* if_false) {
CollectionsBuiltinsAssembler assembler(state);
assembler.BranchIfIterableWithOriginalValueSetIterator(iterable, context,
if_true, if_false);
}
// A helper function to help extract the {table} from either a Set or
// SetIterator. The function has a side effect of marking the
// SetIterator (if SetIterator is passed) as exhausted.
TNode<OrderedHashSet> CollectionsBuiltinsAssembler::SetOrSetIteratorToSet(
TNode<Object> iterable) {
TVARIABLE(OrderedHashSet, var_table);
Label if_set(this), if_iterator(this), done(this);
const TNode<Uint16T> instance_type = LoadInstanceType(CAST(iterable));
Branch(InstanceTypeEqual(instance_type, JS_SET_TYPE), &if_set, &if_iterator);
BIND(&if_set);
{
// {iterable} is a JSSet.
var_table = LoadObjectField<OrderedHashSet>(CAST(iterable),
GetTableOffset(Variant::kSet));
Goto(&done);
}
BIND(&if_iterator);
{
// {iterable} is a JSSetIterator.
// Transition the {iterable} table if necessary.